A replica of the famous memorial statue at the Normandy American Cemetery hides in an office building in downtown D.C.

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

Look closely and you’ll notice that the color changes a third of the way up the tower.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

The school tested mustard gas for the U.S. Army during World War I.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

A building shaped like the Army Corps of Engineers logo, because why not?

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

A historic arena where the Beatles played their first concert in the U.S.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

Washington's iconic carousel has a nice piece of Civil Rights history.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Art deco landmark on the outskirts of Washington, D.C.

A much-maligned monument to teetotalism.

The institution is sitting on a goldmine of 21,000 paints, varnishes, pigments, and primers preserved for posterity.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.